unexpected
un-ex-pect-ed
adjective
Not expected or foreseen; surprising or sudden because it was not anticipated.
"The unexpected rain ruined our picnic plans."
Thesaurus
Synonyms: upset, unannounced, unthought, unprovided for, unlooked-for, unhoped, unheralded, unpredicted, unhoped-for, unforeseen, unthought-of, unanticipated
Antonyms: expected